Momo-

Pressure from her peers, parents, and teachers to be the best she can be and she has a breakdown.

Bakugo-

He literally wouldn't be a villain-

Deku-

Literally what happened in the first episode but without All Might thinking he's a good successor or if he didn't grab onto his leg in the first episode

Hagakure-

probably the traitor

The Bakusquad literally can't be villains. They're too stupid

Jirou can't be one either. It doesn't make sense

Ochako-

... to make money-

Iida-

He stopped caring about life-

Tokoyami-

Wanted to be edgy

Sato-

Robbed a sugar factory

Mineta-

He got kicked out for sexual harassment and decided to get revenge

Shouji

Got bullied for his mouth

Tsu-

Her family was taken hostage and she had to work for the villains to ensure their safety

Aoyama-

Wanted to prove to everyone that he was capable of being powerful

Ojirou-

Literally stopped caring anymore.

The end